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Hi,
barTime % 100 == 0 will not work reliably! If there is no new tick or no CPU
time to do refresh it will skipp new bars a few times!
This is a common problem. Look for similar posts here. You will fined code
samples.
Y
--------------------------------------------------
From: "Mike" <sfclimbers@xxxxxxxxx>
Sent: Tuesday, March 17, 2009 4:04 AM
To: <amibroker@xxxxxxxxxxxxxxx>
Subject: [amibroker] Re: Testing for new bar using string manipulation and
quotation time
> If you have any concerns about rounding, you could use AlmostEqual instead
> of "==".
>
> http://www.amibroker.com/guide/afl/afl_view.php?id=301
>
> Mike
>
> --- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" <zoopfree@xxx> wrote:
>>
>> Thanks a bunch, Mike. Modulo's so much simpler!
>>
>>
>> --- In amibroker@xxxxxxxxxxxxxxx, "Mike" <sfclimbers@> wrote:
>> >
>> > Again, assuming that your approach is sound, better still would be to
>> > use the modulo operator.
>> >
>> > barTime = 103731;
>> >
>> > if (barTime % 100 == 0)
>> > _TRACE( "New bar found" );
>> >
>> > Mike
>> >
>> > --- In amibroker@xxxxxxxxxxxxxxx, "Mike" <sfclimbers@> wrote:
>> > >
>> > > Without commenting on the validity of the approach (I am not a real
>> > > time trader), I can suggest that your problem is coming from a
>> > > formatting incompatibility.
>> > >
>> > > Add a format clause indicating zero decimal places and it will work
>> > > fine.
>> > >
>> > > Note too that your switching back to a number again is redundant and
>> > > even error prone since "==" is not necessarily exact when dealing
>> > > with floats. Just use the string manipulation directly.
>> > >
>> > > barTime = 103731;
>> > > barTimeStr = NumToStr( barTime, 6.0 );
>> > >
>> > > if ( StrRight( barTimeStr, 2 ) == "00" )
>> > > _TRACE ( "New bar found" );
>> > >
>> > > Mike
>> > >
>> > > --- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" <zoopfree@> wrote:
>> > > >
>> > > > Hello, hoping someone can help out with this string conversion
>> > > > problem.
>> > > >
>> > > > In live trading, I am pulling quotation time using TimeNum(), and
>> > > > want
>> > > > to test for the start of a new bar. So my thinking is to simply
>> > > > convert
>> > > > the time to a number, extract the last two characters, convert back
>> > > > to a
>> > > > number and see if it equals 0. If so, that means the last two
>> > > > digits in
>> > > > the quotation time are "00" and hence we are at the start of a new
>> > > > bar.
>> > > >
>> > > > However, the sample code below is always thinking we have a new bar
>> > > > whether the time is, for e.g. :
>> > > >
>> > > > 10:37:31 or
>> > > > 10:37:00
>> > > >
>> > > > Obviously, only the second time should trip the 'new bar' print.
>> > > > But
>> > > > instead, both do:
>> > > >
>> > > >
>> > > > barTime = 103731; // we would normally use TimeNum() here,
>> > > > but
>> > > > using a number for example
>> > > >
>> > > > barTimeStr = NumToStr(barTime);
>> > > >
>> > > > NewBarSeconds = StrToNum ( StrRight(barTimeStr, 2) );
>> > > >
>> > > > printf("NewBarSeconds = " + NewBarSeconds);
>> > > >
>> > > > if (NewBarSeconds == 0)
>> > > >
>> > > > printf(" We have a new bar");
>> > > >
>> > >
>> >
>>
>
>
>
>
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>
------------------------------------
**** IMPORTANT PLEASE READ ****
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